I finally got around to calibrating my old hp 3312a and running through the initial assessment steps. This is turning out to be a little more than I expected. basically, I am hoping someone could enlighten me how this test is being performed.

I have a new digital rigol function generator new oscilloscope and a reliable hp freq counter and would like to go through the steps JUST BECAUSE I WANT TOO and this illustration has me completely confused on what's going on. Unfortunately, there's not too many pics or documents on these old hp instruments on the web. I did find a pic of the voltmeter but in front it has a high low jackwhat the heck is that?

 

512 Triangle Linearity Test.
Specification: < 1% at 100 Hz

a. Set the 3312A for triangle output, the FREQUENCY
dial to 10, and select the X10 frequency RANGE. Using an electronic counter to monitor the 3312A output, adjust the
frequency dial for a period of 10.0 msec. Set the remaining 3312A controls as follows:

SYM,.............................cal
TRIGGER PHASE..........free run
MODULATION...............all buttons out

b. Set the 3480C/D/3484A Voltmeter to measure ac voltage. Connect the voltmeter to the 3312A 50Ω OUTPUT and adjust the AMPLITUDE control for 5.78 V rms as
indicated on the voltmeter

C. Connect the equipment as shown in Figure 5-3

d. Set the controls of the 3480C/D/3484A Voltmeter as
FUNCTION,.................vdc
SAMPLE RATE............hold
FILTER.........................out
TERMINAL...................front
RANGE..........................10

e. Set the MODE switch at the rear of the 3480C/D to
the "ON" position and the DELAY switch to the "OFF"

f. Set the 5262A Time Interval unit to trigger on a +.3 V negative going transition in the START channel and on a .6 V negative going transition in the STOP channel.
Set the 5245L FUNCTION switch to "REMOTE OR TIME INT." and use the 1 us TIME BASE. Set the 5262A for
separate (SEP) channel operation.

g. Set the 3300A for a 20 kHz square wave triggered by the Model 180C DELAYED GATE OUTPUT. Set the channel B AMPLITUDE control of the 3300A to the fully
clockwise position. Set the Model 3302A MODE to MULTIPLE, INPUT PHASE to , and START/STOP PHASE to EXTERNAL.

h. Set the oscilloscope to trigger externally on the PULSE OUTPUT of the Model 3312A. The oscilloscope input should be dc coupled. Adjust the controls of the oscilloscope so that one cycle of the triangle wave occupies
approximately the ful length and height of the display area.

i. Set the oscilloscope delay time control to 5 μs/div.

j. Alternately set the bright dot on the trace precisely on the positive and negative peaks of the triangle wave by adjusting the oscilloscope delay control. Adjust DC OFF
SET for peak voltages of ± 10 V.

 

I agree with you that this is clear as mud. Maybe this worked on HP assembly line but I can't imagine anyone else doing it.

Just curious. Do you have access to _all_ of the exact equipment shown in the illustration? I expect it to be impossible to do the check if you don't.

 

I agree with you that this is clear as mud. Maybe this worked on HP assembly line but I can't imagine anyone else doing it.

Just curious. Do you have access to _all_ of the exact equipment shown in the illustration? I expect it to be impossible to do the check if you don't.

Nope, just hoping someone would know , or even have an idea what he was doing here lol. Sorry took so long to replay, guess notification isnt working. Very surprised no one has even ventured a guess